Which of the following is not a safety equipment in a computer laboratory?

The option that is not a safety equipment in a computer laboratory is "metal detector". A metal detector is not directly related to the safety of the computer laboratory or its equipment. A metal detector is used to detect metal objects and is commonly used in security screening at places like airports, schools or public events. However, surge protectors, smoke detectors, and fire extinguishers are all important safety equipment that should be present in a computer laboratory. Surge protectors are used to protect electronic devices from power surges, while smoke detectors and fire extinguishers are used to detect and prevent fires in the laboratory.